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Asero R, Nucera E, Rizzi A, Aruanno A, Uasuf CG, Manzotti G, Villalta D, Conte M, Pastorello EA, Losappio L, Schroeder JV, Pinter E, Miglionico M, Vantaggio L, Macchia D, Radice A, Marra AM, Barzaghi C, Santucci A, Cortellini G, Peveri S, Montagni M, Demonte A, Borrelli P, Errico MA, Rivolta F, Pravettoni V, Sangalli A, Magnani M, Celi G, Yang B, Costantino MT, Deleonardi G, Boni E, Gattoni M, Rizzini FL, Di Paolo C, Montera M, Giordano A, De Carli M, Murzilli F, Fumagalli F, Maffeis L, Ghiglioni DG, Centonze S, Di Lizia M, Calafiore P, Scala E. Peanut allergy in Italy: A unique Italian perspective. THE JOURNAL OF ALLERGY AND CLINICAL IMMUNOLOGY. GLOBAL 2022; 1:61-66. [PMID: 37780582 PMCID: PMC10509966 DOI: 10.1016/j.jacig.2022.02.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/15/2022] [Revised: 02/12/2022] [Accepted: 02/15/2022] [Indexed: 10/03/2023]
Abstract
Background Peanut allergy has not been well characterized in Italy. Objective Our aim was to better define the clinical features of peanut allergy in Italy and to detect the peanut proteins involved in allergic reactions. Methods A total of 22 centers participated in a prospective survey of peanut allergy over a 6-month period. Clinical histories were confirmed by in vivo and/or in vitro diagnostic means in all cases. Potential risk factors for peanut allergy occurrence were considered. Levels of IgE to Arachis hypogea (Ara h) 1, 2, 3, 6, 8, and 9 and profilin were measured. Results A total of 395 patients (aged 2-80 years) were enrolled. Of the participants, 35% reported local reactions, 38.2% reported systemic reactions, and 26.6% experienced anaphylaxis. The sensitization profile was dominated by Ara h 9 (77% of patients were sensitized to it), whereas 35% were sensitized to pathogenesis-related protein 10 (PR-10) and 26% were sensitized to seed storage proteins (SSPs). Sensitization to 2S albumins (Ara h 2 and Ara h 6) or lipid transfer protein (LTP) was associated with the occurrence of more severe symptoms, whereas profilin and PR-10 sensitization were associated with milder symptoms. Cosensitization to profilin reduced the risk of severe reactions in both Ara h 2- and LTP-sensitized patients. SSP sensitization prevailed in younger patients whereas LTP prevailed in older patients (P < .01). SSP sensitization occurred mainly in northern Italy, whereas LTP sensitization prevailed in Italy's center and south. Atopic dermatitis, frequency of peanut ingestion, peanut consumption by other family members, or use of peanut butter did not seem to be risk factors for peanut allergy onset. Conclusions In Italy, peanut allergy is rare and dominated by LTP in the country's center and south and by SSP in the north. These 2 sensitizations seem mutually exclusive. The picture differs from that in Anglo-Saxon countries.
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Affiliation(s)
- Riccardo Asero
- Ambulatorio di Allergologia, Clinica San Carlo, Paderno Dugnano, Milan, Italy
| | - Eleonora Nucera
- Fondazione Policlinico Universitario A. Gemelli IRCCS, Università Cattolica del Sacro Cuore – Roma, Italy
| | - Angela Rizzi
- Fondazione Policlinico Universitario A. Gemelli IRCCS, Università Cattolica del Sacro Cuore – Roma, Italy
| | - Arianna Aruanno
- Fondazione Policlinico Universitario A. Gemelli IRCCS, Università Cattolica del Sacro Cuore – Roma, Italy
| | - Carina G. Uasuf
- Allergy Center, Institute of Traslational Pharmacology, National Research Council (CNR), Palermo, Italy
| | | | - Danilo Villalta
- SSD di Immunologia e Allergologia, PO S. Maria degli Angeli, Pordenone, Italy
| | | | - Elide A. Pastorello
- Dipartimento di Allergologia, ASST Grande Ospedale Metropolitano Niguarda, Milano, Italy
| | - Laura Losappio
- Dipartimento di Allergologia, ASST Grande Ospedale Metropolitano Niguarda, Milano, Italy
| | - Jan V. Schroeder
- Dipartimento di Allergologia, ASST Grande Ospedale Metropolitano Niguarda, Milano, Italy
| | - Elena Pinter
- UOC Medicina Interna e Immunologia Clinica, Dipartimento Medicina Traslazionale e di Precisione, Sapienza University of Rome, Rome, Italy
| | - Marzia Miglionico
- Allergy and Clinical Immunology Residency Program, Department of Molecular Medicine, Sapienza University of Rome, Italy
| | - Lorenzo Vantaggio
- Allergy and Clinical Immunology Residency Program, Department of Molecular Medicine, Sapienza University of Rome, Italy
| | - Donatella Macchia
- SOS Allergologia e Immunologia Clinica, Ospedale San Giovanni di Dio, Firenze, Italy
| | - Anna Radice
- SOS Allergologia e Immunologia Clinica, Ospedale San Giovanni di Dio, Firenze, Italy
| | - Alessandro M. Marra
- ASST Rhodense - UO Pneumologia - Ospedale di Garbagnate Milanese, Milan, Italy
| | - Claudio Barzaghi
- ASST Rhodense - Ambulatorio di Allergologia - Ospedale di Rho, Italy
| | - Annalisa Santucci
- Ausl Romagna, UOS interdipartimentale di Allergologia, Ospedale degli Infermi di Rimini, Italy
| | - Gabriele Cortellini
- Ausl Romagna, UOS interdipartimentale di Allergologia, Ospedale degli Infermi di Rimini, Italy
| | - Silvia Peveri
- UOsD Allergologia, Ospedale G. Da Saliceto, Piacenza, Italy
| | | | | | - Paolo Borrelli
- SSD Dermatologia - Ambulatorio Allergologia e Immunologia Clinica, Ospedale Beauregard, Aosta, Italy
| | - Micol A. Errico
- SSD Dermatologia - Ambulatorio Allergologia e Immunologia Clinica, Ospedale Beauregard, Aosta, Italy
| | - Federica Rivolta
- General Medicin, Immunology and Allergy Department - IRCCS Foundation Ca' Granda Ospedale Maggiore Policlinico - Milan, Italy
| | - Valerio Pravettoni
- General Medicin, Immunology and Allergy Department - IRCCS Foundation Ca' Granda Ospedale Maggiore Policlinico - Milan, Italy
| | - Andrea Sangalli
- Allergy and Clinical Immunology Residency, University of Milan, Italy
| | | | - Giorgio Celi
- Centro DH Allergologia e Immunologia Clinica, Ospedale Carlo Poma ASST-Mantova, Italy
| | - Baoran Yang
- Centro DH Allergologia e Immunologia Clinica, Ospedale Carlo Poma ASST-Mantova, Italy
| | - Maria T. Costantino
- Centro DH Allergologia e Immunologia Clinica, Ospedale Carlo Poma ASST-Mantova, Italy
| | | | - Elisa Boni
- Allergologia e autoimmunità LUM AUSL Bologna, Italy
| | - Marco Gattoni
- Scuola di Specializzazione in Allergologia e Immunologia Clinica Università degli Studi di Bologna, Italy
| | | | | | - Mariacarmela Montera
- Allergologia e Immunologia Clinica, Ospedale G. Fuscito, Mercato S. Severino; Ospedaliero-Universitaria Ruggi D'Aragona, Salerno, Italy
| | - Annaclaudia Giordano
- Allergologia e Immunologia Clinica, Ospedale G. Fuscito, Mercato S. Severino; Ospedaliero-Universitaria Ruggi D'Aragona, Salerno, Italy
| | - Marco De Carli
- S.O.C Medicina 2, Presidio Ospedaliero Santa Maria della Misericordia, Udine, Italy
| | - Francesco Murzilli
- U.O.S.D. di Allergologia, Ospedale S.S. Filippo e Nicola, Avezzano, Italy
| | | | - Laura Maffeis
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico di Milano, Pediatric Intermediate Care Unit, Milan, Italy
| | - Daniele Giovanni Ghiglioni
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico di Milano, Pediatric Highly Intensive Care Unit, Milan, Italy
| | | | | | | | - Enrico Scala
- Istituto Dermopatico dell’Immacolata, Roma, Italy
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Ji Y, Lin H, Zhao J, Zhang J, Liu H, Li Z. Development of a sensitive sandwich enzyme-linked immunosorbent assay test kit for reliable detection of peanut residues in processed food. Eur Food Res Technol 2021. [DOI: 10.1007/s00217-021-03879-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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van Bergenhenegouwen J, Braber S, Loonstra R, Buurman N, Rutten L, Knipping K, Savelkoul PJ, Harthoorn LF, Jahnsen FL, Garssen J, Hartog A. Oral exposure to the free amino acid glycine inhibits the acute allergic response in a model of cow's milk allergy in mice. Nutr Res 2018; 58:95-105. [PMID: 30340819 DOI: 10.1016/j.nutres.2018.07.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Revised: 07/05/2018] [Accepted: 07/09/2018] [Indexed: 02/07/2023]
Abstract
The conditionally essential amino acid glycine functions as inhibitory neurotransmitter in the mammalian central nervous system. Moreover, it has been shown to act as an anti-inflammatory compound in animal models of ischemic perfusion, post-operative inflammation, periodontal disease, arthritis and obesity. Glycine acts by binding to a glycine-gated chloride channel, which has been demonstrated on neurons and immune cells, including macrophages, polymorphonuclear neutrophils and lymphocytes. The present study aims to evaluate the effect of glycine on allergy development in a cow's milk allergy model. To this end, C3H/HeOuJ female mice were supplemented with glycine by oral gavage (50 or 100 mg/mouse) 4 hours prior to sensitization with cow's milk whey protein, using cholera toxin as adjuvant. Acute allergic skin responses and anaphylaxis were assessed after intradermal allergen challenge in the ears. Mouse mast cell protease-1 (mMCP-1) and whey specific IgE levels were detected in blood collected 30 minutes after an oral allergen challenge. Jejunum was dissected and evaluated for the presence of mMCP-1-positive cells by immunohistochemistry. Intake of glycine significantly inhibited allergy development in a concentration dependent manner as indicated by a reduction in; acute allergic skin response, anaphylaxis, serum mMCP-1 and serum levels of whey specific IgE. In addition, in-vitro experiments using rat basophilic leukemia cells (RBL), showed that free glycine inhibited cytokine release but not cellular degranulation. These findings support the hypothesis that the onset of cow's milk allergy is prevented by the oral intake of the amino acid glycine. An adequate intake of glycine might be important in the improvement of tolerance against whey allergy or protection against (whey-induced) allergy development.
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Affiliation(s)
- Jeroen van Bergenhenegouwen
- Nutricia Research, Uppsalalaan 12, 3584, CT, Utrecht, The Netherlands; Division of Pharmacology, Utrecht Institute for Pharmaceutical Sciences, Faculty of Science, Utrecht University, 3584, CG, Utrecht, The Netherlands.
| | - Saskia Braber
- Division of Pharmacology, Utrecht Institute for Pharmaceutical Sciences, Faculty of Science, Utrecht University, 3584, CG, Utrecht, The Netherlands
| | - Reinilde Loonstra
- Nutricia Research, Uppsalalaan 12, 3584, CT, Utrecht, The Netherlands
| | - Nicole Buurman
- Nutricia Research, Uppsalalaan 12, 3584, CT, Utrecht, The Netherlands
| | - Lieke Rutten
- Nutricia Research, Uppsalalaan 12, 3584, CT, Utrecht, The Netherlands
| | - Karen Knipping
- Nutricia Research, Uppsalalaan 12, 3584, CT, Utrecht, The Netherlands; Division of Pharmacology, Utrecht Institute for Pharmaceutical Sciences, Faculty of Science, Utrecht University, 3584, CG, Utrecht, The Netherlands
| | - Paul J Savelkoul
- Nutricia Research, Uppsalalaan 12, 3584, CT, Utrecht, The Netherlands
| | | | - Frode L Jahnsen
- Centre for Immune Regulation and Department of Immunology, University of Oslo, Oslo, Norway
| | - Johan Garssen
- Nutricia Research, Uppsalalaan 12, 3584, CT, Utrecht, The Netherlands; Division of Pharmacology, Utrecht Institute for Pharmaceutical Sciences, Faculty of Science, Utrecht University, 3584, CG, Utrecht, The Netherlands
| | - Anita Hartog
- Nutricia Research, Uppsalalaan 12, 3584, CT, Utrecht, The Netherlands; Division of Pharmacology, Utrecht Institute for Pharmaceutical Sciences, Faculty of Science, Utrecht University, 3584, CG, Utrecht, The Netherlands
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Vanga SK, Raghavan V. Processing effects on tree nut allergens: A review. Crit Rev Food Sci Nutr 2017; 57:3794-3806. [DOI: 10.1080/10408398.2016.1175415] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Sai Kranthi Vanga
- Department of Bioresource Engineering, Faculty of Agriculture and Environmental Studies, McGill University, Sainte-Anne-de-Bellevue, Quebec, Canada
| | - Vijaya Raghavan
- Department of Bioresource Engineering, Faculty of Agriculture and Environmental Studies, McGill University, Sainte-Anne-de-Bellevue, Quebec, Canada
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Petrášová M, Pospiech M, Tremlová B, Tauferová A, Marcinčák S. Comparison of immunofluorescence method with histochemical and ELISA methods focusing on wheat protein detection in meat products. FOOD AGR IMMUNOL 2017. [DOI: 10.1080/09540105.2017.1328661] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Affiliation(s)
- Michaela Petrášová
- Faculty of Veterinary Hygiene and Ecology, Department of Plant Origin Foodstuffs Hygiene and Technology, University of Veterinary and Pharmaceutical Sciences Brno, Brno, Czech Republic
| | - Matej Pospiech
- Faculty of Veterinary Hygiene and Ecology, Department of Plant Origin Foodstuffs Hygiene and Technology, University of Veterinary and Pharmaceutical Sciences Brno, Brno, Czech Republic
| | - Bohuslava Tremlová
- Faculty of Veterinary Hygiene and Ecology, Department of Plant Origin Foodstuffs Hygiene and Technology, University of Veterinary and Pharmaceutical Sciences Brno, Brno, Czech Republic
| | - Alexandra Tauferová
- Faculty of Veterinary Hygiene and Ecology, Department of Plant Origin Foodstuffs Hygiene and Technology, University of Veterinary and Pharmaceutical Sciences Brno, Brno, Czech Republic
| | - Slavomír Marcinčák
- Department of Hygiene and Food Industry Technology, University of Veterinary Medicine and Pharmacy in Košice, Kosice-Sever, Slovakia
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[Immunological background and pathomechanisms of food allergies]. Bundesgesundheitsblatt Gesundheitsforschung Gesundheitsschutz 2017; 59:723-31. [PMID: 27177897 DOI: 10.1007/s00103-016-2346-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Recent advances in immunology have greatly improved our understanding of the pathomechanisms of food allergies. Food allergies are caused and maintained by complex interactions of the innate and adaptive immune system involving antigen-presenting cells (APC), T cells, group 2 innate lymphoid cells (ILC2), epithelial cells (EC) and effectors cells. Additionally, epigenetic factors, the intestinal microbiome and nutritional factors modulating the gastrointestinal lymphatic tissue probably have a significant impact on allergy development. However, why certain individuals develop tolerance while others mount allergic responses, the factors defining the allergenicity of food proteins, as well as the immunological mechanisms triggering allergy development have yet to be analyzed in detail.
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Shik D, Tomar S, Lee JB, Chen CY, Smith A, Wang YH. IL-9-producing cells in the development of IgE-mediated food allergy. Semin Immunopathol 2017; 39:69-77. [PMID: 27909880 PMCID: PMC5225002 DOI: 10.1007/s00281-016-0605-x] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Accepted: 11/03/2016] [Indexed: 10/20/2022]
Abstract
Food allergy is a harmful immune reaction driven by uncontrolled type 2 immune responses. Considerable evidence demonstrates the key roles of mast cells, IgE, and TH2 cytokines in mediating food allergy. However, this evidence provides limited insight into why only some, rather than all, food allergic individuals are prone to develop life-threatening anaphylaxis. Clinical observations suggest that patients sensitized to food through the skin early in life may later develop severe food allergies. Aberrant epidermal thymic stromal lymphopoietin and interleukin (IL) 33 production and genetic predisposition can initiate an allergic immune response mediated by dendritic cells and CD4+TH2 cells in inflamed skin. After allergic sensitization, intestinal IL-25 and food ingestion enhance concerted interactions between type 2 innate lymphoid cells (ILC2s) and CD4+TH2 cells, which perpetuate allergic reactions from the skin to the gut. IL-4 and cross-linking of antigen/IgE/FcεR complexes induce emigrated mast cell progenitors to develop into the multi-functional IL-9-producing mucosal mast cells, which produce prodigious amounts of IL-9 and mast cell mediators to drive intestinal mastocytosis in an autocrine loop. ILC2s and TH9 cells may also serve as alternative cellular sources of IL-9 to augment the amplification of intestinal mastocytosis, which is the key cellular checkpoint in developing systemic anaphylaxis. These findings provide a plausible view of how food allergy develops and progresses in a stepwise manner and that atopic signals, dietary allergen ingestion, and inflammatory cues are fundamental in promoting life-threatening anaphylaxis. This information will aid in improving diagnosis and developing more effective therapies for food allergy-triggered anaphylaxis.
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Affiliation(s)
- Dana Shik
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, Burnet Avenue, Cincinnati, OH, 45229, USA
| | - Sunil Tomar
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, Burnet Avenue, Cincinnati, OH, 45229, USA
| | - Jee-Boong Lee
- Laboratory of Immunology and Infectious Diseases, Graduate School of Medical Science and Engineering, KAIST, Daejeon, 34141, South Korea
| | - Chun-Yu Chen
- Division of Hematology/Oncology and Bone Marrow Transplantation, Nationwide Children's Hospital, Columbus, 43205, USA
| | - Andrew Smith
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, Burnet Avenue, Cincinnati, OH, 45229, USA
| | - Yui-Hsi Wang
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, Burnet Avenue, Cincinnati, OH, 45229, USA.
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Abstract
With growing evidence of an increase in the prevalence, food allergy has been emerged as a new public health problem. As treatment and management of food allergy remain challenging, more attention has been paid to the importance of prevention of food allergy. Although the exact mechanism of recent epidemic is not fully understood, it is suggested that nutritional exposure in early life may play an important role in food allergy development. The underlying hypothesis is that nutritional status or food exposure in the critical period of fetal development can affect the programming of immune system and modify the risk of immunologic reactions to foods in postnatal life. We review accumulating epidemiological studies to examine an association between nutritional exposure during pregnancy or early infancy and food allergy development in children. We also discuss recent advances in the studies of the genetic and epigenetic regulation of food allergy and evaluate the role of early nutrition in food allergy development to provide a new perspective on the prevention of food allergy.
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Affiliation(s)
- Sun Eun Lee
- Center for Human Nutrition, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
| | - Hyeyoung Kim
- Department of Food and Nutrition, Brain Korea 21 PLUS Project, College of Human Ecology, Yonsei University, Seoul, Korea.
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Petrášová M, Pospiech M, Tremlová B, Randulová Z. Immunofluorescence detection of milk protein in meat products. POTRAVINARSTVO 2015. [DOI: 10.5219/431] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Yang L, Clements S, Joks R. A retrospective study of peanut and tree nut allergy: Sensitization and correlations with clinical manifestations. ALLERGY & RHINOLOGY 2015; 6:39-43. [PMID: 25860169 PMCID: PMC4388875 DOI: 10.2500/ar.2015.6.0108] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
Peanut (PN) and tree nut (TN) allergies are among the leading causes of fatal food-induced anaphylaxis and are increasing in prevalence, especially in children. Their cosensitization and concurrent clinical allergy have been understudied. This retrospective study investigated the correlation between PN and TN allergy, both in terms of in vitro sensitization (IVS) and clinical allergic manifestations. We conducted a retrospective medical record review at the Allergy Clinic at University Hospital of Brooklyn. Fourteen hundred six charts were reviewed, of which 76 (5.4%) had documented relevant clinical allergy: PN allergy but not TN allergy (n = 29) or TN allergy but not PN allergy (n = 11) or both (n = 30). Six patients with PN allergy but no TN exposure history were not included in the analysis. The majority of patients (67/76, 88.1%) had a concurrent history of asthma, rhinoconjunctivitis, or AD. Sensitivity of TN IVS predicting PN IVS was 38/39 (97%). Similarly, sensitivity of PN IVS predicting TN IVS was 38/42 (91%). Sensitivity of TN clinical allergy predicting PN allergy was 30/59 (51%). Sensitivity of PN clinical allergy predicting TN allergy was 30/41 (73%). The total number of organ systems involved in reported clinical reactions correlated with IVS to TN (p = 0.004) but not IVS to PN (p = 0.983). In summary, we found PN sensitization predicts TN sensitization in vitro, with lower predictability for clinical reactions.
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Affiliation(s)
- Lihua Yang
- Department of Internal Medicine, State University of New York Downstate Medical Center, Center for Allergy and Immunology, Brooklyn, New York, USA
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Petrášová M, Zichová E, Pospiech M, Bohuslava Tremlová B. Immunofluorescent determination of wheat protein in meat products. POTRAVINARSTVO 2014. [DOI: 10.5219/340] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
In food industry nowadays, there are various plant-origin protein additives which are meant for production of meat products. Among the most frequent additives of this type there are different kinds of flour, starch, fiber, and plant-origin proteins. Their usage at present is limited by the existing legislation not to prevent consumer deception but also for reasons of possible influence on consumer health. Therefore, this problem is paid a lot of attention not only in the Czech Republic but also all over the world. The main risk is seen in the impossibility to choose a suitable foodstuff for an individual prone to allergic reactions. Potential allergens are also often plant-origin raw materials which are added into foodstuffs for their technological qualities and low price. Wheat is widely cultivated cereal as well as an important source of proteins. After ingestion or inhalation, wheat proteins may cause adverse reactions. These adverse effects include a wide range of disorders which are dependent on the method of contact with wheat protein. These adverse effects can then take the form of various clinical manifestations, such as celiac disease, T-cell mediated inflammatory bowel disease, dermatitis, skin rash, breathing difficulties, allergy to pollen or to wheat flour or food allergy to foodstuffs containing gluten. The only possible protection against adverse immune reactions for those with food allergies is strictly excluding the allergen from their diet. Although the number of studies dealing with the reduction or loss of allergenicity is increasing, yet these practices are not common. Most of the population suffering from food allergies is thus still dependent on strict exclusion of foodstuffs causing adverse allergic reactions from their diet. In order to avoid misleading consumers and also to protect allergic consumers, analytical methods applicable to all types of foodstuffs have been developed. Unfortunately, detection of allergens in foodstuffs is relatively difficult because of the fact that they occur in trace amounts and are often masked by various parts of the product. This paper deals with detection of wheat protein in meat products bought in the retail network of the Czech Republic. Ten cooked meat products, especially types of sausages and soft salami which stated wheat protein in their composition, were examined. The samples were processed using the method of immunofluorescence and stained with Texas Red fluorochrome. The presence of wheat protein was demonstrated in all the examined meat products. From the results it follows that the method of immunofluorescence is suitable for detection of wheat protein in meat products.
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López-Calleja IM, de la Cruz S, Pegels N, González I, García T, Martín R. High resolution TaqMan real-time PCR approach to detect hazelnut DNA encoding for ITS rDNA in foods. Food Chem 2013; 141:1872-80. [DOI: 10.1016/j.foodchem.2013.05.076] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2012] [Revised: 12/14/2012] [Accepted: 05/02/2013] [Indexed: 10/26/2022]
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Husain Z, Schwartz RA. Peanut allergy: An increasingly common life-threatening disorder. J Am Acad Dermatol 2012; 66:136-43. [DOI: 10.1016/j.jaad.2011.02.031] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2010] [Revised: 02/13/2011] [Accepted: 02/17/2011] [Indexed: 10/17/2022]
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Relative quantification of walnuts and hazelnuts in bakery products using real-time polymerase chain reaction. Eur Food Res Technol 2011. [DOI: 10.1007/s00217-011-1482-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Verweij MM, Hagendorens MM, De Knop KJ, Bridts CH, De Clerck LS, Stevens WJ, Ebo DG. Young infants with atopic dermatitis can display sensitization to Cor a 9, an 11S legumin-like seed-storage protein from hazelnut (Corylus avellana). Pediatr Allergy Immunol 2011; 22:196-201. [PMID: 20579306 DOI: 10.1111/j.1399-3038.2010.01088.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Allergy to hazelnut (Corylus avellana) can be severe and occur at young age. Atopic dermatitis (AD) can involve sensitization to various foods. The objective is to investigate the pattern of hazelnut sensitization in infants with AD. Sera of 34 infants all under 1 year of age and suffering from AD were selected according to prior specific IgE results. Twenty-nine infants were sensitized to traditional food allergens, five were not. From the 29 infants with a sensitization to at least one food allergen, 20 demonstrated IgE reactivity to hazelnut. All sera were analyzed with the allergen microarray immunoassay (ImmunoCAP ISAC). Twelve (60%) of the children with IgE reactivity to hazelnut demonstrated sensitization to Cor a 9, the 11S legumin-like seed-storage protein from hazelnut. In these infants, no sensitization to Cor a 1, the homologue of the major birch pollen allergen Bet v 1 (Betula verrucosa), or the lipid transfer protein (Cor a 8) from hazelnut was demonstrable. Half of the children sensitized to Cor a 9 demonstrated IgE reactivity to its homologue in peanut (Arachis hypogaea; Ara h 3) from which five were also sensitized to Gly m 6 from soy (Glycine max). None of the infants with AD without IgE reactivity to hazelnut demonstrated sensitization to Cor a 1, 8, or 9. In conclusion, young infants with atopic dermatitis sensitized to hazelnut can already display IgE reactivity to Cor a 9, a potentially dangerous hazelnut component. The mechanism(s) of this early sensitization and its clinical significance remain elusive.
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Affiliation(s)
- Marjoke M Verweij
- Department of Immunology-Allergology-Rheumatology, Faculty of Medicine, University of Antwerp, Antwerpen, Belgium
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Somers LS. Peanut Allergy: Case of an 11-Year-Old Boy with a Selective Diet. ACTA ACUST UNITED AC 2011; 111:301-6. [DOI: 10.1016/j.jada.2010.10.043] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2010] [Accepted: 10/26/2010] [Indexed: 11/30/2022]
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Wainstein BK, Studdert J, Ziegler M, Ziegler JB. Prediction of anaphylaxis during peanut food challenge: usefulness of the peanut skin prick test (SPT) and specific IgE level. Pediatr Allergy Immunol 2010; 21:603-11. [PMID: 20444154 DOI: 10.1111/j.1399-3038.2010.01063.x] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Cutoffs (decision points) of the peanut skin prick test (SPT) and specific IgE level for predicting peanut allergy have been proposed. It is not known whether decision points indicating a significant risk of severe reactions on challenge differ from those indicating probable allergy. We aimed at determining the usefulness of allergy tests for predicting the risk of anaphylaxis on challenge following the ingestion of up to 12 g of peanut in peanut-sensitized children. Children attending the Allergy Clinic who had a positive peanut SPT and completed open-label in-hospital peanut challenges were included. The challenge protocol provided for challenges to be continued beyond initial mild reactions. Eighty-nine in-hospital peanut challenges were performed. Thirty-four were excluded as the challenge was not completed, leaving 55 for analysis. Children who completed the challenge and did not react (n = 28) or reacted without anaphylaxis (n = 6) represented the comparison group (n = 34). The study group comprised 21 children whose challenge resulted in anaphylaxis. The mean peanut SPT wheal size and specific IgE level were associated with the severity of reactions on challenge. Among the 21 children, who developed anaphylaxis, in only 3 cases was anaphylaxis the initial reaction. Unexpectedly, a history of anaphylaxis was not predictive of anaphylaxis on challenge. Anaphylaxis developed at cumulative doses of peanut ranging from 0.02 to 11.7 g. Provided that a fixed amount of peanut is ingested, available tests for peanut allergy may assist in predicting the risk of anaphylaxis during challenge in peanut-sensitized children.
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Affiliation(s)
- Brynn Kevin Wainstein
- Department of Immunology and Infectious Diseases, Sydney Children's Hospital, High Street, Randwick, Sydney, New South Wales, Australia.
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Wang H, Yuan F, Wu Y, Yang H, Xu B, Liu Z, Chen Y. Detection of allergen walnut component in food by an improved real-time PCR method. J Food Prot 2009; 72:2433-5. [PMID: 19903414 DOI: 10.4315/0362-028x-72.11.2433] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A real-time PCR method aimed at the gene sequence of the walnut vicilin-like seed storage protein was established for the detection of the allergen walnut in food. The primers and probe were designed based on published methods. The method provided positive results for walnut and negative results for other tested agricultural plant materials including pecan. The intrinsic detection limit of the method was 0.00125 ng of walnut DNA, and the practical detection limit was 0.001% (wt/wt) walnut content in wheat; both of these values are lower than that of previously published methods. Therefore, this real-time PCR method is sufficiently specific and sensitive for the detection of walnut component in food.
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Affiliation(s)
- Haiyan Wang
- Institute of Food Safety, Chinese Academy of Inspection and Quarantine, Chaoyang District, Beijing 100123, People's Republic of China
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Al-Ahmed N, Alsowaidi S, Vadas P. Peanut allergy: an overview. ALLERGY, ASTHMA, AND CLINICAL IMMUNOLOGY : OFFICIAL JOURNAL OF THE CANADIAN SOCIETY OF ALLERGY AND CLINICAL IMMUNOLOGY 2008; 4:139-43. [PMID: 20525136 PMCID: PMC2868887 DOI: 10.1186/1710-1492-4-4-139] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
: Peanut allergies have been increasing in prevalence in most industrialized countries. Onset is typically in early childhood, with a trend towards earlier ages of presentation. The allergy is lifelong in most affected children, although 15-22% will outgrow their peanut allergy, usually before their teenage years. Manifestations of peanut allergy range from mild to severe, and risk factors predisposing to severe reactions are discussed. However, even in the absence of risk factors, peanut allergic individuals may still experience life-threatening anaphylactic reactions. Approaches to investigation and treatment, patterns of cross-reactivity and possible causes of rising prevalence are discussed.
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Affiliation(s)
- Nasser Al-Ahmed
- Division of Allergy and Clinical Immunology, St. Michael's Hospital, University of Toronto, Toronto, ON
| | - Shirina Alsowaidi
- Division of Allergy and Clinical Immunology, St. Michael's Hospital, University of Toronto, Toronto, ON
| | - Peter Vadas
- Division of Allergy and Clinical Immunology, St. Michael's Hospital, University of Toronto, Toronto, ON
- Division of Allergy and Clinical Immunology, Carter Wing, Room 8-161, St. Michael's Hospital, 30 Bond St., Toronto, ON M5B 1W8
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Venkatachalam M, Roux KH, Sathe SK. Biochemical characterization of soluble proteins in pecan [Carya illinoinensis (Wangenh.) K. Koch]. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2008; 56:8103-8110. [PMID: 18693738 DOI: 10.1021/jf801268k] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Pecans (cv. Desirable) contained approximately 10% protein on a dry weight basis. The minimum nitrogen solubility (5.9-7.5%) at 0.25-0.75 M trichloroacetic acid represented the nonprotein nitrogen. Among the solvents assessed for protein solubilization, 0.1 M NaOH was the most effective, while borate saline buffer (pH 8.45) was judged to be optimal for protein solubilization. The protein solubility was minimal in the pH range of 3-7 and significantly increased on either side of this pH range. Increasing the NaCl concentration from 0 to 4 M significantly improved ( approximately 8-fold increase) protein solubilization. Following Osborne protein fractionation, the alkali-soluble glutelin fraction (60.1%) accounted for a major portion of pecan proteins followed by globulin (31.5%), prolamin (3.4%), and albumin (1.5%), respectively. The majority of pecan polypeptides were in the molecular mass range of 12-66 kDa and in the pI range of 4.0-8.3. The pecan globulin fraction was characterized by the presence of several glycoprotein polypeptides. Lysine was the first limiting essential amino acid in the defatted flour, globulin, prolamin, and alkaline glutelin fractions. Leucine and tryptophan were the first limiting essential amino acids in albumin and acid glutelin fractions, respectively. Rabbit polyclonal antibodies detected a range of pecan polypeptides in the 12-60 kDa range, of which the globulin fraction contained the most reactive polypeptides.
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Affiliation(s)
- Mahesh Venkatachalam
- Department of Nutrition, Food and Exercise Sciences, Florida State University, 402 Sandels Building, College of Human Sciences, Tallahassee, Florida 32306-1493, USA
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Rolland JM, Apostolou E, de Leon MP, Stockley CS, O'Hehir RE. Specific and sensitive enzyme-linked immunosorbent assays for analysis of residual allergenic food proteins in commercial bottled wine fined with egg white, milk, and nongrape-derived tannins. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2008; 56:349-354. [PMID: 18163561 DOI: 10.1021/jf073330c] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Regulations introduced by the Food Standards Australia New Zealand in December 2002 require all wine and wine product labels in Australia to identify the presence of a processing aid, additive or other ingredient, which is known to be a potential allergen. The objective of this study was to establish sensitive assays to detect and measure allergenic proteins from commonly used processing aids in final bottled wine. Sensitive and specific enzyme-linked immunosorbent assays (ELISA) were developed and established for the proteins casein, ovalbumin, and peanut. Lower limits of detection of these proteins were 8, 1, and 8 ng/mL, respectively. A panel of 153 commercially available bottled Australian wines were tested by these ELISA, and except for two red wines known to contain added whole eggs, residuals of these food allergens were not detected in any wine. These findings are consistent with a lack of residual potentially allergenic egg-, milk-, or nut-derived processing aids in final bottled wine produced in Australia according to good manufacturing practice at a concentration that could cause an adverse reaction in egg, milk, or peanut/tree-nut allergic adult consumers.
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Affiliation(s)
- Jennifer M Rolland
- Department of Immunology, Monash University, The Alfred, Commercial Road, Melbourne, Victoria, Australia 3004.
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Sicherer SH, Sampson HA. Peanut allergy: Emerging concepts and approaches for an apparent epidemic. J Allergy Clin Immunol 2007; 120:491-503; quiz 504-5. [PMID: 17689596 DOI: 10.1016/j.jaci.2007.07.015] [Citation(s) in RCA: 216] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2007] [Revised: 07/13/2007] [Accepted: 07/13/2007] [Indexed: 01/14/2023]
Abstract
Peanut allergy is typically lifelong, often severe, and potentially fatal. Because reactions can occur from small amounts, the allergy presents patients with significant obstacles to avoid allergic reactions. In North America and the United Kingdom, prevalence rates among schoolchildren are now in excess of 1%, framing an increasing public health concern and raising research questions about environmental, immunologic, and genetic factors that may influence outcomes of peanut allergy. This review focuses on recent observations that continue to question the influences of maternal and infant diet on outcomes of peanut allergy, and explore how peanut may be uniquely suited to induce an allergic response. We highlight studies that affect current diagnosis, management, and the nature of advice that can be provided to patients, including the utility of diagnostic tests, doses that elicit reactions, characteristics of reactions from exposure, issues of cross-reactivity, concerns about peanut contamination of manufactured goods, and the natural course of the allergy. Clinical, molecular, and immunologic advances are reviewed, highlighting research discoveries that influence strategies for improved diagnosis, prevention, and treatment. Among the therapeutic strategies reviewed are sublingual and oral immunotherapy, anti-IgE, Chinese herbal medicine, and vaccine strategies.
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Affiliation(s)
- Scott H Sicherer
- Elliot and Roslyn Jaffe Food Allergy Institute, Division of Allergy and Immunology, Department of Pediatrics, Mount Sinai School of Medicine, New York, NY, USA.
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A novel real-time polymerase chain reaction (PCR) method for the detection of hazelnuts in food. Eur Food Res Technol 2007. [DOI: 10.1007/s00217-007-0644-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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A novel real-time polymerase chain reaction method for the detection of pecan nuts in food. Eur Food Res Technol 2007. [DOI: 10.1007/s00217-007-0639-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Wen HW, Borejsza-Wysocki W, DeCory TR, Durst RA. Peanut Allergy, Peanut Allergens, and Methods for the Detection of Peanut Contamination in Food Products. Compr Rev Food Sci Food Saf 2007; 6:47-58. [DOI: 10.1111/j.1541-4337.2007.00017.x] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Brežná B, Hudecová L, Kuchta T. A novel real-time polymerase chain reaction (PCR) method for the detection of walnuts in food. Eur Food Res Technol 2006. [DOI: 10.1007/s00217-005-0214-8] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Stickler M, Chin R, Faravashi N, Gebel W, Razo OJ, Rochanayon N, Power S, Valdes AM, Holmes S, Harding FA. Human population-based identification of CD4(+) T-cell peptide epitope determinants. J Immunol Methods 2003; 281:95-108. [PMID: 14580884 DOI: 10.1016/s0022-1759(03)00279-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A human cell-based method to identify functional CD4(+) T-cell epitopes in any protein has been developed. Proteins are tested as synthetic 15-mer peptides offset by three amino acids. Percent responses within a large donor population are tabulated for each peptide in the set. Peptide epitope regions are designated by difference in response frequency from the overall background response rate for the compiled dataset. Epitope peptide responses are reproducible, with a median coefficient of variance of 21% when tested on multiple random-donor sets. The overall average response rate within the dataset increases with increasing putative human population antigenic exposure to a given protein. The background rate was high for HPV16 E6, and was low for human-derived cytokine proteins. The assay identified recall epitope regions within the donor population for the protein staphylokinase. For an industrial protease with minimal presumed population exposure, immunodominant epitope peptides were identified that were found to bind promiscuously to many HLA class II molecules in vitro. The peptide epitope regions identified in presumably unexposed donors represent a subset of the total recall epitopes. Finally, as a negative control, the assay found no peptide epitope regions in human beta2-microglobulin. This method identifies functional CD4(+) T-cell epitopes in any protein without pre-selection for HLA class II, suggests whether a donor population is pre-exposed to a protein of interest, and does not require sensitized donors for in vitro testing.
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Affiliation(s)
- Marcia Stickler
- Genencor International, 925 Page Mill Road, Palo Alto, CA 94304, USA
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33
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Affiliation(s)
- F Harding
- Genencor International, Palo Alto, California 94304, USA.
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Paller AS, Nimmagadda S, Schachner L, Mallory SB, Kahn T, Willis I, Eichenfield LF. Fluocinolone acetonide 0.01% in peanut oil: therapy for childhood atopic dermatitis, even in patients who are peanut sensitive. J Am Acad Dermatol 2003; 48:569-77. [PMID: 12664021 DOI: 10.1067/mjd.2003.174] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
BACKGROUND Fluocinolone acetonide 0.01% in a blend of refined peanut and mineral oils has been used as treatment for scalp psoriasis for several years, but only more recently for atopic dermatitis. OBJECTIVE We sought to study the effectiveness for atopic dermatitis, potential for adrenal axis suppression, and safety of the fluocinolone acetonide 0.01% in oil in children with atopic dermatitis, including children with atopic dermatitis and peanut allergic sensitivity. METHODS Three separate studies were performed in children aged 2 to 12 years with atopic dermatitis: multicenter double-blind, randomized, and vehicle-controlled trial; cortisol stimulation testing; and prick testing, patch testing, and monitored medication use in children with peanut allergic sensitivity. RESULTS Improvement of >/=50% was demonstrated within 2 weeks in 81% to 87% of 81 patients treated with active medication versus 39% of 45 children treated with vehicle oil alone. No adrenal suppression occurred after 4 weeks of therapy in 32 patients. None of 9 patients who were peanut sensitive reacted to either the full formulation or vehicle in prick or patch testing; 20 children who were peanut sensitive showed no allergic reactions after application of the medication. CONCLUSION Fluocinolone 0.01% in peanut oil is an effective alternative to the use of topical corticosteroid agents in ointment, cream, and lotion forms in children. No evidence of adrenal suppression or adverse local effects were demonstrated in these studies. The medication was well tolerated in patients with peanut allergic sensitivity.
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Affiliation(s)
- Amy S Paller
- Department of Pediatrics, Children's Memorial Hospital, Northwestern University Medical Center, USA.
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36
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Birmingham N, Thanesvorakul S, Gangur V. Relative immunogenicity of commonly allergenic foods versus rarely allergenic and nonallergenic foods in mice. J Food Prot 2002; 65:1988-91. [PMID: 12495022 DOI: 10.4315/0362-028x-65.12.1988] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Food allergies affect 6 to 8% of children and 2% of adults in the United States. For reasons that are not clear, eight types of food account for a vast majority (approximately 90%) of food-induced hypersensitivity reactions. In this study, C57Bl/6 mice were used to test the hypothesis that commonly allergenic foods are intrinsically more immunogenic than rarely allergenic or nonallergenic foods in allergy-susceptible hosts. Groups of mice (n = 4 to 5) were injected intraperitoneally with the protein extracts (plus alum as an adjuvant) from chicken eggs, peanuts, almonds, filberts-hazelnuts, walnuts, soybeans, and wheat (commonly allergenic foods) and coffee, sweet potatoes, carrots, white potatoes, cherries, lettuce, and spinach (rarely allergenic and nonallergenic foods). Primary and secondary immune responses (as measured by specific IgG1 antibody serum levels) were measured by an enzyme-linked immunosorbent assay. Proteins from peanuts, almonds, filberts, sweet potatoes, cherries, and spinach elicited robust primary and/or secondary immune responses. Proteins from eggs, walnuts, and lettuce elicited poor primary responses but significant secondary responses. In contrast, wheat, soybeans, coffee, carrots, and white potatoes elicited barely detectable to poor primary and secondary immune responses. The order of the immunogenicity levels of these foods in mice is as follows: almonds = filberts > spinach (Rubisco) > peanuts > or = sweet potatoes > cherries > lettuce > walnuts > chicken eggs > carrots > or = white potatoes > wheat = coffee = soybeans. In summary, these data demonstrate for the first time that: (i) foods vary widely with regard to their relative immunogenicity in allergy-susceptible hosts and (ii) intrinsic immunogenicity in mice does not distinguish commonly allergenic foods from rarely allergenic or nonallergenic foods.
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Affiliation(s)
- Neil Birmingham
- Food Allergy and Immunology Laboratory, Department of Food Science and Human Nutrition, Michigan State University, 302-B, GM Trout Building, East Lansing, Michigan 48823, USA
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Amoli MM, Hand S, Hajeer AH, Jones KP, Rolf S, Sting C, Davies BH, Ollier WER. Polymorphism in the STAT6 gene encodes risk for nut allergy. Genes Immun 2002; 3:220-4. [PMID: 12058257 DOI: 10.1038/sj.gene.6363872] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2001] [Accepted: 02/13/2002] [Indexed: 11/08/2022]
Abstract
Nut allergy is an important and potentially life threatening food allergy with a prevalence of one in 150 children in the UK population. STAT6 (signal transducer and activator of transcription) is an important molecule in the induction and regulation of an allergic response, which maps to chromosome 12q in a region previously linked with total serum IgE concentration and atopy in different populations. We have examined the frequency of a single nucleotide polymorphism (SNP) in the 3'UTR region of STAT6 gene in 71 UK Caucasoid patients diagnosed with nut allergy and 45 atopic patients without nut allergy using PCR-RFLP and compared these with 184 UK healthy controls. The STAT6 G allele frequency was significantly increased in nut allergy patients compared with blood donor controls (P < 0.0001, OR = 2.9, 95% CI: 1.7-4.9), which was under a recessive model (GG vs GA+AA, P = 0.0001, OR = 3.2, 95% CI: 1.7-5.8) but not in atopic patients without nut allergy. The G allele was most frequent in the severe cases and GG homozygosity was associated with the increased risk of severe reaction (OR = 3.9, 95% CI: 1.9-8.3). We conclude that STAT6 3'UTR polymorphism is associated with susceptibility and severity in nut allergic patients in our population.
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Affiliation(s)
- M M Amoli
- The Centre for Integrated Genomic Medical Research, Manchester University Medical School, Stopford Building, Oxford Road, Manchester M13 9PT, UK
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Robotham JM, Teuber SS, Sathe SK, Roux KH. Linear IgE epitope mapping of the English walnut (Juglans regia) major food allergen, Jug r 1. J Allergy Clin Immunol 2002; 109:143-9. [PMID: 11799381 DOI: 10.1067/mai.2002.120558] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
BACKGROUND Peanut and tree nut allergies can be life-threatening, and they appear to be growing in prevalence. Jug r 1, a 2S albumin seed storage protein, was previously characterized as a major English walnut food allergen. OBJECTIVE We sought to identify the linear IgE-binding epitopes of Jug r 1 and to determine which, if any, amino acids are necessary for this binding to occur. METHODS Pools of sera from walnut-allergic patients and overlapping peptides synthesized on an activated cellulose membrane were used to screen for IgE-binding epitopes. Mutational analysis of the immunodominant epitope was carried out through single and multisite amino acid substitutions. Inhibition assays were performed through use of affinity-purified IgE, soluble forms of the epitope peptide, and the recombinant 2S albumin, rJug r 1. RESULTS One immunodominant linear epitope was identified. Amino acid mutations to the epitope demonstrated that the residues RGEE, at positions 36 through 39, were minimally required for IgE binding. Probing of this epitope with sera from each of 20 patients revealed 15 of the sera to be positive. Binding of patients' IgE to the epitope was inhibited with a soluble form of the peptide; however, soluble peptide did not completely inhibit the binding of IgE to the intact rJug r 1. CONCLUSION One major linear IgE-reactive epitope and its critical core amino acid residues have been identified. Mutation of any of these core amino acids resulted in loss of IgE binding to the epitope, and this points toward the feasibility of reducing allergenicity in genetically modified walnuts. However, strong evidence for the existence of conformational epitopes was also obtained.
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Affiliation(s)
- Jason M Robotham
- Department of Biological Science and Structural Biology Program, Florida State University, Tallahassee 32306-4370, USA
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